Dental light



Sept 13 1927 J. A. HAND ET Al.

DENTAL LIGHT Filed July l5, 1925 2 Sheets-Sheet l @ganga Patented Sept. 13,1927,

PATENT g orrlfcs.

'JAY'AQH'AND ANDIcHA'UNcEY n. intitola. oF Dn'rnor'r, MiCHIGAN, Ass'fIGNoRs To 'rma PELTON azonANn COMPANY, vor' nETnoInmcHrGAN, A CORPORATION or .Y nrcnreAN.

"Application mamy i5, 1925. serial No.: 43,782.

This invention relates tode'nt'al lights'and has .for its objectfafixt-ure arranged to supporta cluster of. lights inl almost any posl#` tion and atl anyvangularityv withln a' given4 range A. f I' 1 In dentalwork it is found that: the cluster system ,of` illumination' isv most `satisfactory for thedentist in working on a' pat-ients l mouth', but so far' as We aref aware ino means cluster oflights'tothe position most desir- Vable for-the dentistin each :particular-operation. "1 f Inthe drawingsz; A

Fig. 1 is a perspective' o'f the "fixture at-A tachedtothe wall. A

' vFigris a vertical lsection of ,thel wall sup-'j i Y have` on their ends frictionashoes t and abutp'ortingbracket. Fig."3` 's a.- fragmentary? vertical-section ofthe samepart taken in" a position `90 de#` grecs removed, and indicatedjby vthe sectionvlines 3--3 of FigyQ. Y. Fig. 4; is a section through the hub `ofthe spider that supports theclu'ster fofh'ghts.

throu h the same parts but 90 degrees remove C Figs.V 6 and 7- are details ofthe device .bj1 which friction is applied to the ball whic sus endsthe hub.

' lpig. 8 is a detail of the telescoping rod.

Fig. 9 is a section taken on the line9--9- of Fig. 8.

Figs. 10 and 11 are detalls of the-sup' Cal with the weight that it suspends yand the moment thereof is such that the plunger and spring just about counterbalances it. In fact the plunger with the spring is a oounterbalanclng evice which is nicely calculated so that theresistance of the spring `together with the friction of the parts is calculated to retain the armor two-part Fig. 5 is a part elevation and part section` port for the cluster at the outer ends .ofthe telescoping rod .l in. anyv given position to which it is either depressed or raised.-

Obviously the telescoping arrangement permits thev cluster .of lightsy to be drawn outor pressedin `toward the wallas the de mands of the occasionv dictate.

tightly-enough -so that there is considerable friction andfhence'ithe hanger rod n will On theY end of the'two-*part arm h is aimee-joint made .by holding the'two-half spheres 7" and 7c `togethe'r' with a pin'm.; this is riveted togetherstay in any position inwhich it is set; this 1s shown by the dotted lines of F igl.

VThis hangerrodis'providedat its end' with a ball o thatis fitted into the hub casing p 'by theremovablecap r. A pair of studs s enter the hub `through the cap and m'ent 'plates u spaced with the coil springs v. Thefabutment plates ware secured to- This'will vpermit thel hub, together wit the" spider arms to be tilted at any angle with- 1n a given range, not only in one plane, but in an infinite number of planes so that the action isa ball-andsocket joint action or a universal joint. The friction serves to hold the cluster in -any given position of adjustment.

y designates a switch button that operates the switch arm a, arranged to engage or vdisengage the terminals 1, to connect with the leading-in wires 2. The other cords 3 lead through the spider arms to the incandescent lights contained within the globes 4.-; these globes are-preferably holophane shades.`

What we claim is:

1. In a lighting fixture for the purpos specified, 'the combination of a hanger memofthe hub casing and secured" ber, a cluster of lights supported on the end f of the hanger member b a ball-and-socket joint, a spring friction evice co-operating with said balland-socket joint for supplying the friction necessary to hold the cluster of lights in any given position of adjustment, a telescoping rod, means for pivotally connecting said hanger to said rod and frictionally maintainin the hanger inany adjusted position, im a! rotatable counterbalancing device :for supportin and maintaining said rod in any a juste position.

2. In a lighting fixture for the purpose specified, the combination of a han er mem'- ber provided at its lower end wit a ball, and a light cluster provided with a pluralit of hollow spider arms running into a hu casing at the center, said hub casing containing spring pressure devices adapted to bear against the ball to afford friction to hold the light cluster in any given position of adustment of the ball. u

3. in a lighting fixture for the purpose specified, the combination of a hanger member provided at its lower end with a ball, a light cluster provided with a plurality of hollow spider arms running into a hub cas ing at the center, said hub casing containing spring pressure devices adapted tol bean against the ball to afford friction to hold the light cluster in an given position of adjustment of the bal, electric conductin wires contained in the casin and a switc i containined in the casing ielow the ball joint for controlling the passage of current through said conducting wires.

. 4. n a lighting fixture for the urpose specified, the combination of a wall racket, a rotatable cylinder containing therein a plunger, a resisting spring contained within the cylinder, and a light-supporting arm pivotally supported on the top of the cylinder and provided with a ortion adapted for connection with the pihnger whereby the plunger `tends to counterbalance the arm and retain it in a given position of adjustment.

v5. In a lighting fixture for the purpose specified, the combination of a ivoted hanger member, a cluster of l hts avin a supportin hub, means within said bu for universa y connecting said cluster and hanger and maintaining said cluster in any position of adjustment, and a rotatable counterbalancing device for pivotall supporting and maintaining the vsaid anger in art ad'usted ition.

6. lig t fixture for dental and like pur' poses, comprising a supporting arm, a anger rod, means for mounting the arm on a wall, said means including a member which permits the arm to be adjusted to different positions, a lurality of lights forming. cluster in w ich the lights are rigid with respect to each other, and means connecting the cluster to the rod, said means includinv a universal joint connection whereby the c uster can be tiltably adjusted as a unit with res ect to the supporting rod.

7. In a lig ting fixture for the purpose specified,` the combination of a pivoted hanger member, a cluster of lights havin a supporting hub, means within said hug for universally connecting said cluster and hanger and maintaining said cluster in any position of adjustment, and a counterbalancing device for pivotally supportin and maintaining the said hanger in any a justed position.

In testimony whereof we haveh aixed ourl signatures.

JAY A. HAND. CHAUNCEY R. PELTGN. 

